Quick Answer. A low hemoglobin count, also known as anemia, is caused by pregnancy, a menstrual period, a diet low in iron, blood loss, or a disease that causes the body to produce fewer red blood cells or to destroy red blood cells. According to the Mayo Clinic, medications also sometimes cause anemia.
A cytotoxic T cell (also known as TC, cytotoxic T lymphocyte, CTL, T-killer cell, cytolytic T cell, CD8+ T-cell or killer T cell) is a T lymphocyte (a type of white blood cell) that kills cancer cells, cells that are infected (particularly with viruses), or cells that are damaged in other ways.
Art Connections. 1  Helper T cells release cytokines while cytotoxic T cells kill the infected cell. 2  Helper T cells are CD4+, while cytotoxic T cells are CD8+. 3  MHC II is a receptor found on most body cells, while MHC I is a receptor found on immune cells only. 4  The T cell receptor is found on both CD4+ and CD8+ T cells.